I need to change the email address on my account. Is that allowed?

Yes, from Profile & Brand, though changing your email may require verification — which is the sensible security step so someone can't just hijack your account by swapping the address. If you run into any snag, the contact form's "Account & Billing Support" subject exists for exactly this, and the support team can walk you through it. Make sure you still have access to the old inbox until the change fully lands, in case a verification link goes there.